Rack



FIG. 1 is a perspective view of a rack showing our new design;

FIG. 2 is a front elevational view thereof.

FIG. 3 is a top plan view thereof.

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines throughout the present design are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a rack, as shown and described. 